Small Rewards, Larger Rewards, and Even Bigger Questions: Using the Classic Marshmallow Test to Explore Contemporary Issues in Psychology

Abstract

Despite being one of the most well-known laboratory-based tasks in psychology, certain methodological and theoretical considerations surrounding the marshmallow test have gone largely unstudied until recently. These considerations reflect gaps in the delay of gratification literature and broader contemporary issues concerning the replicability of seminal findings and the lack of an agreed upon theoretical framework in the field. Accordingly, my dissertation uses the classic marshmallow test to explore the contemporary issues of replication and theory in psychology in a series of three studies. In Study 1, the marshmallow test is at the center of a case study unpacking the nuances of direct and conceptual replication; a tool designed to support ongoing replication efforts is proposed. Study 2 executes a full-scale replication of the paradigm from the case study, and introduces a methodological extension to improve the paradigm’s experimental rigour while making it amenable to an evolutionary–developmental framework. Finally, Study 3 applies an evolutionary–developmental framework to examine how this perspective might help account for individual differences in marshmallow test behavior. Through these three studies, my dissertation provides an example of how engaging in replication and applying an evolutionary–developmental framework to the marshmallow test literature to inform outstanding theoretical questions in psychology might be mutually beneficial endeavors.